Posted by E. Stange on January 13, 1999 at 10:00:25:
In Reply to: Re: Does anyone know the lift, duration and lobe centers for the 251's cam? posted by Joe Cimoch on January 09, 1999 at 19:31:08:
Tom Langdon, a member and former president of Inliners International, derived the following information on a 265 MOPAR IND cam using a friend's Cam Doctor program. Similar results were found using a 251 cam out of a marine engine.
The Cam Doctor's Analysis CYL #1: 03-06-97
INTAKE & EXHAUST
LOBE CENTER SEP = 108.7 CAM DEG
VALVE OVERLAP = -11.6 CRANK DEG
INTAKE LASH .012"
VALVE OPENING = -5.5 'BTDC
LOBE CENTER = 108.7 'ATDC
VALVE CLOSURE = 31.7 'ABDC
DURATION = 206.2 CRANK DEG
MAX CAM LIFT = .38035 IN.
NET VALVELIFT = .38035 IN.
LOBE 'AREA' = 28.11 IN * DEG
EXHAUST LASH .012"
VALVE OPENING = 31.6 'BBDC
LOBE CENTER = 108.7 'BTDC
VALVE CLOSURE = -6.1 'ATDC
DURATION = 205.5 CRANK DEG
MAX CAM LIFT = .37882 IN.
NET VALVELIFT = .37882 IN.
LOBE 'AREA' = 27.92 IN * DEG
Notice how the lift closely matches the specs. listed from the manuals in other replys (.379). Also notice the mild duration in the Cam Dr. specs! No wonder MOPAR flathead sixes are noted for high torque at low RPM's.